Locking ring



FIG. 1 is a top plan view of the locking ring showing the new design;

FIG. 2 is a bottom plan view of the locking ring of FIG. 1;

FIG. 3 is a front plan view of the locking ring of FIG. 1;

FIG. 4 is a rear plan view of the locking ring of FIG. 1;

FIG. 5 is a side plan view of the locking ring of FIG. 1; and,

FIG. 6 is an opposite side plan view of the locking ring of FIG. 1. 

CLAIM The ornamental design for a locking ring, as shown and described. 